I have to agree with Zero on this issues. On other thing to try is this, if you have mother board monitoring software, what does it report for voltages? If not, you can jumper the power supply on and check with a multi-meter. I have had similar issues and they were power related.
Check the 3.3V AGP supply...this is what caused my system to display vertical columns of random stuff.
I love this movie!!!
The CG was very well done, seamlessly integrating the Transformers into the live action. The humor was Definitely spot on. A must see!!!